Navigation ECU Power Source Circuit (08/2010 - 08/2011): Procedure

1. Disconnect the F53 display and navigation module display connector.
   Fig 1: Identifying F53 Display And Navigation Module Display Connector

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2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F53-10 (GND1) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F53-1 (+B1) - F53-10 (GND1)	Always	11 to 14 V
   F53-2 (ACC) - F53-10 (GND1)	Engine switch on (ACC)	11 to 14 V
   F53-3 (IG) - F53-10 (GND1)	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   2